One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6,9,7)(8,11,12,10)(13,14,19,21)(15,18,24,20)(16,27,26,22)(17,28,25,23)(1,2,3,4)(13,15)(14,20)(16,25)(17,26)(18,21)(19,24)(22,23)(27,28)(6,7)(10,11)(14,21)(15,24)(16,26)(23,28) involution — undirected(5,7,9,6)(8,11,12,10)(13,16,19,26)(14,22,21,27)(15,25,24,17)(18,28,20,23)(5,8,9,12)(6,10,7,11)(13,17,19,25)(14,23,21,28)(15,26,24,16)(18,27,20,22)(13,18)(14,24)(15,21)(16,28)(17,22)(19,20)(23,26)(25,27) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.